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Influence of Intercritical Annealing on Microstructure and Mechanical Properties of a Medium Manganese Steel

MPS-Authors
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Dutta,  Aniruddha
Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Ponge,  Dirk
Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Nellessen,  Monika
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Haupt, M., Dutta, A., Ponge, D., Sandlöbes, S., Nellessen, M., & Hirt, G. (2017). Influence of Intercritical Annealing on Microstructure and Mechanical Properties of a Medium Manganese Steel. Procedia Engineering, 207, 1803-1808.


Cite as: http://hdl.handle.net/21.11116/0000-0001-7192-A
Abstract
Medium manganese steels which belong to the 3rd generation advanced high strength steels are a promising material for the automotive industry due to their remarkable strength-ductility-combination enabling to reduce material and production costs. Today it is well established that the mechanical properties are strongly dependent on the intercritical annealing parameters which lead to the formation of an ultra-fine grained multi-phase microstructure. After cold-rolling the microstructure contains deformed α martensite which transforms into recrystallized globular-shaped ferrite and austenite during intercritical annealing. This microstructure causes a pronounced yield point elongation in tensile tests due to the soft ferrite grains. The present work demonstrates that a Fe-12Mn-3Al-0.05C medium manganese steel can be produced by an adapted hot forming route showing a martensitic matrix with embedded reversed austenite islands after intercritical annealing in the cold-rolled material. After intercritical annealing at 555°C for 1 h the cold strip exhibits a volume fraction of 15.7 reversed austenite, an ultimate tensile strength (UTS) of 815 MPa and a total elongation of 23 without observing a yield point elongation. © 2017 The Authors. Published by Elsevier Ltd.